Method for block-based digital image watermarking

Details Method for block-based digital image watermarking Method for block-based digital image watermarking

2006-02-28

2006-02-28

Johns, Andrew W. (Department: 2621)

Image analysis

Applications

Reexamination Certificate

active

07006663

ABSTRACT:
A method of encoding a watermark into a digital image. The method includes partitioning an original image into blocks and then determining a variance value of each block. The blocks are then arranged according to the variance values. A number of selected blocks are identified, where the number depends upon the size of the watermark. The blocks selected are then arranged by their location. Data from the watermark is used to replace bits in a representation of each of the selected blocks with data from the watermark. A method of decoding is also discussed.

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patent: 6633653 (2003-10-01), Hobson
patent: 6665417 (2003-12-01), Yoshiura et al.

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